137787389 has 2 divisors, whose sum is σ = 137787390. Its totient is φ = 137787388.

The previous prime is 137787383. The next prime is 137787413. The reversal of 137787389 is 983787731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 105411289 + 32376100 = 10267^2 + 5690^2 .

It is a cyclic number.

It is not a de Polignac number, because 137787389 - 2¹² = 137783293 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 137787389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (137787383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68893694 + 68893695.

It is an arithmetic number, because the mean of its divisors is an integer number (68893695).

Almost surely, 2^137787389 is an apocalyptic number.

It is an amenable number.

137787389 is a deficient number, since it is larger than the sum of its proper divisors (1).

137787389 is an equidigital number, since it uses as much as digits as its factorization.

137787389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 53.

The square root of 137787389 is about 11738.2873111881. The cubic root of 137787389 is about 516.4994025796.

The spelling of 137787389 in words is "one hundred thirty-seven million, seven hundred eighty-seven thousand, three hundred eighty-nine".